Classified by Measuring the Angles

• Regular Polygon: Polygon in which all the sides of angle are same and all the interior angle of the polygon are equal is called regular polygon.
• Irregular Polygon: The polygon in which is not regular a polygon is known as Irregular Polygon. Irregular polygons do not have equal sides and measure of angles.
• Convex Polygon: The polygon whose measure of an interior angle is less than 180° is termed as a convex polygon. The vertices of a convex polygon are always outwards.
• Concave Polygons: In concave polygons, at least one angle measures more than 180°. Those polygons which are not convex are concave polygons.
• Quadrilateral Polygons: Quadrilateral polygons are the polygons which are four-sided or with four angles i.e. quadrangle. Every polygon which forms four angles is known as quadrilateral polygons.
• Pentagon Polygons: The polygon which consists of five sides is termed as pentagon polygon.

Classified by Measuring the Sides

• Triangle: The three-sided polygon is known as the triangle.
• Quadrilateral: Any figure which is a closed four-sided figure is known as a quadrilateral.
• Pentagon: The closed figure which is formed by five straight lines is known as a pentagon.
• Hexagon: The six-sided polygon is known as a hexagon.
• Heptagon: The polygon with seven sides is termed as a heptagon.
• Octagon: As the name says, the Eight-sided polygon is known as Octagon.
• Nonagon: The polygon which possesses nine straight lines is known as nonagon.
• Decagon:  The closed figure made with ten straight lines is termed as decagon polygon.

The process of removing a plant from the place where it has been growing and replanting it in another is called transplantation.
Tomato and paddy are examples of crops grown by transplantation.

Periodization with regard to history, is the process of categorizing or dividing history into various time periods. The periodization is done on the basis of major socio-economic and political changes. These drastic socio-economic and political changes differ one period from another in history. We see, the socio-economic and political changes were totally different in ancient, medieval and modern period.

Inactivated polio vaccine should not be given at the time of fever or diarrhoea because it may interfere with drugs or antibiotics given fro diarrhoea. But oral polio vaccine can be given at the time of fever and diarrhoea as it does not interfere with any drug or antibiotic.

Plate tectonics is the theory that Earth’s outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core. The plates act like a hard and rigid shell compared to Earth’s mantle. This strong outer layer is called the lithosphere.

-6/7 be added to 3/7 to get -3/7
-6/7 + 3/7 = (-6 +3)/7 = -3/7

The British gave much importance to the practices of surveying because they believed that a country had to effectively administred. Therefore, they carried out detailed surveys by the early 19th century in orders to map the entire country:
• They conducted revenue surveys in villages.
• They made efforts to know, the topography, the soil quality, the flora, the fauna, the local histories and the cropping pattern.
• They also introduced census operations, held at the intervals of every ten years from the end of the 19th century. They prepared detailed records of the number of people in all the provinces of India, nothing information on castes, religious and occupations separately.
• The British also carried on several other surveys such as botanical surveys, zoological surveys, etc. In the way, the gathered all the fatcs that were essential for administering a country.

• The Mahalwari system is one of the three major land tenure systems implemented by the British in India.
• Mahalwari system was introduced in 1833 during the period of William Bentick.
• It was introduced in Central Province, North-West Frontier, Agra, Punjab, Gangetic Valley, etc of British India.
• The Mahalwari system had many provisions of both the Zamindari System and Ryotwari System.
• In this system, the land was divided into Mahals. Each Mahal comprises one or more villages.
• Ownership rights were vested with the peasants.
• The villages committee was held responsible for collection of the taxes.